アイスランド · 成層火山
Hrómundartindur
Hromundartindur
- タイプ
- 成層火山
- 標高
- 550m
- 最終噴火
- 不明
- タイプ
- 成層火山
- 国
- アイスランド
- 地域
- 大西洋 / Iceland Neovolcanic Rift Volcanic Province
- 標高
- 550m
- 座標
- 64.083, -21.333
- 最終噴火
- 不明
- テクトニクス環境
- リフト帯 / 海洋地殻 (< 15 km)
- 火山地形
- 複成火山
- 主要岩石
- 玄武岩 / ピクライト質玄武岩
地質学的概要
Hrómundartindur is a small volcanic system located south of Thingvallavatn lake and immediately east of the Hengill volcanic system. It lies at a ridge-ridge-transform triple junction at the eastern end of the Reykjanes Peninsula, where the west Iceland volcanic zone changes direction from approximately W-E to SW-NE. The most recent eruptions in the Ölkeduháls area took place at the end of the latest glacial period, this geothermal field contains numerous hot springs, mud pools, fumaroles, and mineral warm springs. Increased seismic activity and slow uplift beginning in 1994, and continuing for more than 4 years, indicated magma flow into the volcanic system at 7 km depth. Hrómundartindur was last active about 10,000 years ago.
Wikipedia の要約
英語版の要約Hrómundartindur is a mountain in Iceland north of Hveragerði with an elevation of 540 metres (1,770 ft). It to the east of Hengill and is the central volcano of an adjacent 25 km (16 mi) long Hrómundartindur volcanic system, which contains the Ölkeduháls geothermal field. Like Hengill this area is close to the south-eastern triple junction of the Hreppar microplate, is seismically active, and associated with the Western volcanic zone and the South Iceland seismic zone. To the north-east are multiple tindars, and there is a Holocene lava flow called Tjarnahnúkshraun which covers 4 km2 (1.5 sq mi) with a volume of 0.03 km3 (0.0072 cu mi). The lava ranges from picrite basalt, being predominantly tholeiite basalt with some basaltic andesite.
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